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Low water stannous fluoride plus zinc citrate dentifrice with improved stability, rheology, and efficacy

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Title: Low water stannous fluoride plus zinc citrate dentifrice with improved stability, rheology, and efficacy.
Abstract: A dentifrice composition having a low water phase comprising effective amounts of polyphosphate and ionic active ingredients. ...


Browse recent Colgate-palmolive Company patents - New York, NY, US
Inventors: Linh Fruge, Steven Wade Fisher, Michael Prencipe
USPTO Applicaton #: #20120207686 - Class: 424 52 (USPTO) - 08/16/12 - Class 424 
Drug, Bio-affecting And Body Treating Compositions > Dentifrices (includes Mouth Wash) >Fluorine Or Fluorine Compound Containing

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The Patent Description & Claims data below is from USPTO Patent Application 20120207686, Low water stannous fluoride plus zinc citrate dentifrice with improved stability, rheology, and efficacy.

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The present embodiments relate to dentifrice compositions. In particular, the present embodiments relate to dentifrice compositions having a low water phase comprising effective amounts of polyphosphate and ionic active ingredients. The ionic active ingredients may include fluoride ions and metal ions such as stannous and zinc ion source.

BACKGROUND

Polyphosphates and ionic active ingredients have been used in dentifrices to promote oral health. Polyphosphates are known anti-tartar agents that help retard calculus formation. Metal ions such as stannous and zinc ions are known to be effective anti-microbial agents. These metal ions provide anti-gingivitis and anti-plaque benefits and may also improve breath and reduce sensitivity. Stannous fluoride has been used in dentistry since the 1950\'s as a fluoride source to prevent dental caries. Similarly, zinc citrate has been shown to have anti-plaque, anti-gingivitis and anti-tartar efficacy. In addition, zinc has also shown its efficacy as an anti-malodor agent.

While such actives have previously been used in dentifrices, for several reasons it has proven challenging to provide these actives together in a stable single phase. Once such technical problem is to preserve the bioavailability of stannous ions and maximize the chemical stability of the stannous ion source. Certain polyphosphates are unstable in high aqueous systems. Such polyphosphates in an aqueous system are susceptible to hydrolysis unless they are present at a high pH, which is not compatible with high stannous availability. Stannous fluoride tends to precipitate stannous ions in aqueous environments, thereby reducing the efficacy of the stannous ions in the oral care composition. Additionally, the polyphosphates react with ionic fluoride in oral compositions at ambient temperature to produce monofluorophosphate ions and alter the pH of the composition. This reaction compromises the efficacy of the oral composition and its ability to provide stable ionic fluoride and polyphosphate to the oral surfaces.

Other attempts to provide such efficacious dentifrice compositions have reduced the amount of water present in the composition. Reducing the amount of water would theoretically reduce or eliminate the stability issues associated with the fluoride, polyphosphate and other ionic actives. However, reducing the level of water, and optionally replacing some or all of the removed water with a humectant, creates problems in obtaining acceptable rheology and thickening properties in the composition. When water, which is a highly polar solvent, is removed, conventional thickening agents such as carboxymethylcellulose (“CMC”) tend to inadequately gel up. Attempts to reduce water content in dentifrice compositions have included the dentifrices described in, e.g., EP 0 638 307 B1; U.S. Pat. No. 4,647,451; and U.S. Pat. No. 5,670,137. Such known formulations have been shown to exhibit progressive thickening over time, which prolongs the time period or even prevents the dentifrice from reaching a rheological steady state. Ideally, dentifrice formulations need to reach a steady state for consumer acceptance within two weeks. If a formulation routinely increases in viscosity over time, dispensing of the formulation will become difficult, which will likely result in consumer dissatisfaction.

U.S. Pat. No. 6,696,045 discloses dentifrice compositions comprising a single low water phase comprising polyphosphate and ionic active ingredients. Although compositions comprising glass H polyphosphate, which has a long chain of about 21 phosphate groups, and sodium or stannous fluoride are disclosed, with the sodium fluoride being optionally combined with zinc citrate and the stannous fluoride being optionally combined with zinc lactate, there is no disclosure of how to combine stannous, fluoride and zinc salts in a low water composition in combination with short chain length polyphosphates in a low water single phase system.

U.S. Pat. No. 5,578,293 discloses dentifrice compositions comprising a high water phase comprising polyphosphate and ionic active ingredients, including stannous ions.

U.S. Pat. No. 5,487,906 also discloses dentifrice compositions comprising a high water phase comprising polyphosphate and ionic active ingredients, including stannous ions.

Other attempts to provide dentifrice compositions having these actives in efficacious amounts involved the use of dual compartmented packaging wherein the reactive ingredients are physically separated until the time of brushing. (See, e.g., WO98/22079, “Dentifrice Compositions Containing Polyphosphate and Fluoride.”) However, such dual-compartmented packages are typically considerably more expensive than the conventional laminate tubes that have been used for many years to contain and dispense dentifrices. They also may be problematic in terms of ease of consumer use and uniform dispensing of approximately equal amounts of each composition during each consumer use. Therefore it remains desirable to provide single phase compositions that can be packaged in conventional laminate squeeze tubes.

The description herein of certain advantages and disadvantages of known compositions, methods, and apparatus is not intended to limit the scope of the embodiments to their exclusion (or inclusion, as the case may be). Indeed, certain embodiments may include one or more known compounds, methods, or apparatus without suffering from the afore-mentioned disadvantages.

BRIEF

SUMMARY

There is a need in the art to provide dentifrice compositions that can effectively combine sources of stannous, fluoride, and zinc ions in combination with a polyphosphate in a low water single phase system that has efficacious delivery of water-unstable actives and/or actives that are reactive with respect to each other in a single phase. There is also a need in the art to provide low water single phase dentifrice compositions that have an improved rheological profile, and in particular have a stable rheology that effectively reduces or eliminates progressive thickening of the composition over time which in turn provides a composition that can effectively be dispensed over the period of its shelf life.

In a first aspect, the embodiments described herein provide a dentifrice composition comprising in a single phase: an orally acceptable vehicle; a source of fluoride ions; a source of stannous ions; a source of zinc ions; and at least one polyphosphate salt selected from the group consisting of inorganic polyphosphate salts that have equal to or less than three phosphorous atoms; wherein the dentifrice composition has a total water content of less than about 10% based on the weight of the composition.

In a second aspect, the embodiments described herein provide a dentifrice composition comprising, in a single phase, an orally acceptable vehicle, the vehicle including a thickening agent comprising a polymer system comprising, in combination, a cross-linked polyvinylpyrrolidone and a gum, wherein the dentifrice composition has a total water content of less than about 10% based on the weight of the composition.

In a third aspect, the embodiments described herein provide a method for the treatment and prevention of bacterial plaque accumulation and/or for the prevention of erosion or demineralization comprising: administering to the oral cavity the dentifrice composition described above.

In a fourth aspect, the embodiments described herein provide a method for the manufacture of a dentifrice composition, the method comprising: providing a source of stannous ions; mixing the source of stannous ions with an aqueous buffer system adapted to chelate the stannous ions in a premix formed thereby; and combining the premix with at least one active component and an orally acceptable vehicle of the dentifrice composition.

As will be demonstrated herein, the preferred embodiments can provide a dentifrice that provides multiple therapeutic benefits by combining stannous ions and fluoride ions, e.g. as stannous fluoride, zinc ions, e.g. as zinc citrate, and polyphosphates, e.g. in the form of tetrasodium pyrophosphate/sodium tripolyphosphate. The use of a particular buffer system can stabilize the stannous ions in the presence of the zinc ions and polyphosphates, and leave the stannous ions active in the single phase low water composition for effective anti-microbial action when used for cleaning the teeth.

The preferred embodiments of the present invention also can provide a dentifrice formulation having a stabilized stannous ion source and a polyphosphate, for example tetrasodium pyrophosphate and/or sodium tripolyphosphate, in a single tube.

The preferred embodiments of the present invention also can provide a low water dentifrice system combining, in a single tube, stannous fluoride, zinc citrate and polyphosphates, in particular having a phosphorous atom of equal to or less than 3, for example tetrasodium pyrophosphate and sodium tripolyphosphate, in a single phase system that provides bioavailable tin, zinc, fluoride and polyphosphate to the oral surfaces.

The preferred embodiments of the present invention also may provide a low water single phase dentifrice system having a stable rheology that does not tend to progressively thicken over time, but instead thickens quickly, for example within a few days of manufacture, and reaches a stable viscosity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing the relationship between Brookfield viscosity and time (days) for the dentifrice composition of Formula B in the examples.

FIG. 2 is a graph showing the relationship between Brookfield viscosity and time (days) for a comparative dentifrice composition.



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stats Patent Info
Application #
US 20120207686 A1
Publish Date
08/16/2012
Document #
13503801
File Date
10/29/2009
USPTO Class
424 52
Other USPTO Classes
International Class
/
Drawings
2


Citrate
Dentifrice


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